The rule of thumb above can be generalized for the case in which β is a function of frequency. The general rule states that at the intersection of and the difference of slopes (called the rate of closure) should not exceed 20 dB/decade.
The rule of thumb above can be generalized for the case in which β is a function offrequency. The general rule states that at the intersection of andthe difference of slopes (called the rate of closure) should not exceed20 dB/decade.